Remove PHP and Ruby implementations and related files

.github/instructions.md

@@ -74,10 +74,8 @@ Each implementation has detailed instructions in `.github/instructions/[language
 - **Python**: FastAPI with Poetry, pytest, and Pydantic models
 - **Java**: Spring Boot with comprehensive quality tools
 - **C#**: ASP.NET Core with StyleCop analyzers
-- **PHP**: Slim Framework with PSR standards
 - **Go**: Chi Router with oapi-codegen, high test coverage
 - **Kotlin**: Ktor with coroutines and serialization
-- **Ruby**: Rails API with multi-database support (planned)
 
 ## Quality Metrics and Comparison
 

.github/instructions/README.md

@@ -12,10 +12,8 @@ This directory contains GitHub Copilot coding agent instructions for the Lamp Co
 ├── python.instructions.md      # Python-specific guidance
 ├── java.instructions.md        # Java-specific guidance
 ├── csharp.instructions.md      # C#-specific guidance
-├── php.instructions.md         # PHP-specific guidance
 ├── go.instructions.md          # Go-specific guidance
-├── kotlin.instructions.md      # Kotlin-specific guidance
-└── ruby.instructions.md        # Ruby-specific guidance
+└── kotlin.instructions.md      # Kotlin-specific guidance
 ```
 
 ## How It Works

.github/workflows/copilot-setup-steps.yml

@@ -49,14 +49,6 @@ jobs:
           cache: 'maven'
           cache-dependency-path: 'src/java/pom.xml'
 
-      - name: Setup PHP
-        uses: shivammathur/setup-php@v2
-        with:
-          php-version: '8.3'
-          extensions: mbstring, xml, ctype, iconv, intl, pdo_sqlite, dom, filter, gd, iconv, json, mbstring, pdo
-          tools: composer:v2
-          coverage: xdebug
-
       - name: Install poetry
         run: pipx install poetry